build: add missing comma in node.gyp

This commit adds a missing comma for consistency with the
surrounding lines.

PR-URL: nodejs#31959
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Сковорода Никита Андреевич <[email protected]>

Author: cjihrig

node.gyp

@@ -648,7 +648,7 @@
         'src/http_parser_adaptor.h',
         'src/js_stream.h',
         'src/large_pages/node_large_page.cc',
-        'src/large_pages/node_large_page.h'
+        'src/large_pages/node_large_page.h',
         'src/memory_tracker.h',
         'src/memory_tracker-inl.h',
         'src/module_wrap.h',